<template>
  <div class="cart">
    <h4>全部商品</h4>
    <div class="cart-main">
      <div class="cart-th">
        <div class="cart-th1">全部</div>
        <div class="cart-th2">商品</div>
        <div class="cart-th3">单价（元）</div>
        <div class="cart-th4">数量</div>
        <div class="cart-th5">小计（元）</div>
        <div class="cart-th6">操作</div>
      </div>
      <div class="cart-body">
        <ul class="cart-list" v-for="(cart,index) in cartInfoList" :key="cart.id">
          <li class="cart-list-con1">
            <input type="checkbox" name="chk_list" :checked="cart.isChecked == 1" @change="isCheckCart(cart,$event)">
          </li>
          <li class="cart-list-con2">
            <img :src="cart.imgUrl">
            <div class="item-msg">{{cart.skuName}}</div>
          </li>
          <li class="cart-list-con4">
            <span class="price">{{cart.skuPrice}}</span>
          </li>
          <li class="cart-list-con5">
            <a href="javascript:void(0)" class="mins" @click="handler('minus',-1,cart)">-</a>
            <input autocomplete="off" type="text" :value="cart.skuNum" minnum="1" class="itxt" @change="handler('change',$event.target.value),cart">
            <a href="javascript:void(0)" class="plus" @click="handler('add',1,cart)">+</a>
          </li>
          <li class="cart-list-con6">
            <span class="sum">{{cart.skuNum * cart.skuPrice}}</span>
          </li>
          <li class="cart-list-con7">
            <a href="#none" class="sindelet" @click="deleteCartList(cart)">删除</a>
            <br>
            <a href="#none">移到收藏</a>
          </li>
        </ul>
      </div>
    </div>
    <div class="cart-tool">
      <div class="select-all">
        <input class="chooseAll" type="checkbox" :checked="isAllCheck&&cartInfoList.length>0" @click="upDataAllCheckShopCart($event)">
        <span>全选</span>
      </div>
      <div class="option">
        <a @click="deleteCheckShop">删除选中的商品</a>
        <a href="#none">移到我的关注</a>
        <a href="#none">清除下柜商品</a>
      </div>
      <div class="money-box">
        <div class="chosed">已选择
          <span>0</span>件商品</div>
        <div class="sumprice">
          <em>总价（不含运费） ：</em>
          <i class="summoney">{{totalPrice}}</i>
        </div>
        <div class="sumbtn">
          <router-link class="sum-btn" to="/trade">结算</router-link>
        </div>
      </div>
    </div>
  </div>
</template>

<script>
import {mapGetters} from 'vuex'
  export default {
    name: 'ShopCart',
    mounted() {
        this.getData()
    },
    methods: {
        getData() {
          this.$store.dispatch('getCartList')
        },    
        // 修改某个产品的个数
       async handler(type,disNum,cart) {
          // type:为了区分这三个元素
          // disNum形参：+ 变化量 （1） - 变化量 （-1） input最终的个数（并不是变化量）
          // cart: 哪一个产品【身上有id】
          // 向服务器发请求,修改产品的数量
          // console.log('派发actions,通知服务器修改数量',type,disNum,cart);  =0的话是不变不减也不加
          switch(type) {
            case 'add':
              disNum = 1
              break;
            case 'minus':
              // 如果用户
              disNum = cart.skuNum > 1 ? cart.skuNum-- : 1
              break;
            case 'change':
              if(isNaN(disNum) || disNum < 1) {
                disNum = 0
              } else {
                // 如果用户非法输入有小数点
                disNum = parseInt(disNum) - cart.skuNum
              }
              break;
          }
          // 派发actions向购物车修改商品数量
          let params = { skuId: cart.skuId, skuNum: 1 };
          try {
            // 成功干什么  给服务器带参数 要修改的商品 和修改的数量
            await this.$store.dispatch('upDateShopCart',params)
            // 再一次获取服务器数据进行展示
            this.getData()
          } catch (error) {
            console.log(error.message);
          }
        },

       async deleteCartList(cart) {
          try {
            // 成功干什么  获取需要删除的产品
            await this.$store.dispatch('deleteShopCartById',cart.skuId)
            this.getData()
          } catch (error) {
            // 失败输出错误信息
            return Promise.reject('删除购物车产品接口出错了')
          }
        },
       async isCheckCart(cart,event) {
        try {
          // 带给服务器的参数不是布尔值，应该是0|1
          let isChecked = event.target.checked ? '1' : '0'
          // 修改服务器成功，再次获取服务器的数据（购物车）
          await this.$store.dispatch('checkCart',{skuId:cart.skuId,isChecked})
          this.getData()
        } catch (error) {
          alert('切换产品选中失败')
        }
       },
      //  
       async deleteCheckShop() {
        try {
          // 派发actions
          await this.$store.dispatch('deleteAllCheckCartShop')
          // 再次发请求
          this.getData()
        } catch (error) {
          alert(error.message)
        }
       },
       async upDataAllCheckShopCart(event) {
         try {
          // 所有的选中状态都得跟着全选按钮变
          let isChecked = event.target.checked ? '1' : '0'
          await this.$store.dispatch('dataAllShopCart',isChecked)
          this.getData()
         } catch (error) {
          alert(error.message) 
         }
       }
    },
    computed:{
      ...mapGetters(['cartList']),
        // 简化
        cartInfoList() {
          return this.cartList.cartInfoList || []
        },
        // 计算商品的总价
        totalPrice() {
          let sum = 0;
          this.cartInfoList.forEach(item=>{
            sum += item.skuNum + item.skuPrice
          })
          return sum
        },
        // 判断底部复选框是否勾选
        isAllCheck() {
          // 遍历数组的原理只要全部元素isChecked属性都为1===>为真 true
          // 只要有一个不是1 就为假false
          return this.cartInfoList.every(item=>item.isChecked==1)
        },
    
    },
  
  }
</script>

<style lang="less" scoped>
  .cart {
    width: 1200px;
    margin: 0 auto;

    h4 {
      margin: 9px 0;
      font-size: 14px;
      line-height: 21px;
    }

    .cart-main {
      .cart-th {
        background: #f5f5f5;
        border: 1px solid #ddd;
        padding: 10px;
        overflow: hidden;

        &>div {
          float: left;
        }

        .cart-th1 {
          width: 25%;

          input {
            vertical-align: middle;
          }

          span {
            vertical-align: middle;
          }
        }

        .cart-th2 {
          width: 25%;
        }

        .cart-th3,
        .cart-th4,
        .cart-th5,
        .cart-th6 {
          width: 12.5%;

        }
      }

      .cart-body {
        margin: 15px 0;
        border: 1px solid #ddd;

        .cart-list {
          padding: 10px;
          border-bottom: 1px solid #ddd;
          overflow: hidden;

          &>li {
            float: left;
          }

          .cart-list-con1 {
            width: 15%;
          }

          .cart-list-con2 {
            width: 35%;

            img {
              width: 82px;
              height: 82px;
              float: left;
            }

            .item-msg {
              float: left;
              width: 150px;
              margin: 0 10px;
              line-height: 18px;
            }
          }
          .cart-list-con4 {
            width: 10%;

          }

          .cart-list-con5 {
            width: 17%;

            .mins {
              border: 1px solid #ddd;
              border-right: 0;
              float: left;
              color: #666;
              width: 6px;
              text-align: center;
              padding: 8px;
            }

            input {
              border: 1px solid #ddd;
              width: 40px;
              height: 33px;
              float: left;
              text-align: center;
              font-size: 14px;
            }

            .plus {
              border: 1px solid #ddd;
              border-left: 0;
              float: left;
              color: #666;
              width: 6px;
              text-align: center;
              padding: 8px;
            }
          }

          .cart-list-con6 {
            width: 10%;

            .sum {
              font-size: 16px;
            }
          }

          .cart-list-con7 {
            width: 13%;

            a {
              color: #666;
            }
          }
        }
      }
    }

    .cart-tool {
      overflow: hidden;
      border: 1px solid #ddd;

      .select-all {
        padding: 10px;
        overflow: hidden;
        float: left;

        span {
          vertical-align: middle;
        }

        input {
          vertical-align: middle;
        }
      }

      .option {
        padding: 10px;
        overflow: hidden;
        float: left;

        a {
          float: left;
          padding: 0 10px;
          color: #666;
        }
      }

      .money-box {
        float: right;

        .chosed {
          line-height: 26px;
          float: left;
          padding: 0 10px;
        }

        .sumprice {
          width: 200px;
          line-height: 22px;
          float: left;
          padding: 0 10px;

          .summoney {
            color: #c81623;
            font-size: 16px;
          }
        }

        .sumbtn {
          float: right;

          a {
            display: block;
            position: relative;
            width: 96px;
            height: 52px;
            line-height: 52px;
            color: #fff;
            text-align: center;
            font-size: 18px;
            font-family: "Microsoft YaHei";
            background: #e1251b;
            overflow: hidden;
          }
        }
      }
    }
  }
</style>